[racket-dev] massive penalty for (except-in (planet ...) ...) require ?

From: John Clements (clements at brinckerhoff.org)
Date: Thu Feb 17 17:04:53 EST 2011

Running a particular file has been crushingly slow for me, and I finally traced it down (apparently) to the addition of an "except-in" wrapper around a planet require.  Adding the wrapper changes a consistently sub-1-second compile-and run into a big thrashing memory-fest. Is there some kind of invasive renaming that must occur when an "except-in" annotation is added to a require?


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